Tractor.



M. L. SENDERLING.

TRACTOR. APPLICATION F'ILED OCT- 14, 1913- Patented June 6, 1916.

6 SHEETS-SHEET I.

INVENTOR WITNESSES A TTORNEY-S M. L. SENDERLING.

TRACTOR.

APPLICATION FILED OCT-14.1913.

1 1 86,340. Patented June 6, 1916.

6 SHEETS-SHEET 2.

WITNESSES INVENTOR MW K WW 4 w mowers Patented June 6, 1916.

I 6 SHEETS-SHEET 3.

.IK VILNIW I H TRACTOR.

APPLICATION FILED OCT. 14. l9l3.

M. L. SENDERLING.

' INVENTOI? JA/D/SAA/N ATTORNEYS M/IFT/N L.

M. L. SENDERUNG.

TRACTOR.

APPL'ICATION FILED OCTL I4, 1913.

Patented J une 6, 1916.

SHEETSSHEET 4.

-/17TORIVEY8 M. L. SENDERUNG.

TRACTOR.

APPLICATION FILED OCT- 14. I913.

Patented June 6, 1916.

. 6 SHEETS-SHEET 5. ')J[ 7 It! w III/ III VII/[IA WITNESSES mm ma %\@M ATTORNE Y8 M. L. SENDERUNGQ TRACTOR.

APPLICAHON FILED OCT. :4, 1913.

Patented June 6, 1916.

6 SHEETS-SHEET 6.

l l l I I I l l I .II

ll I 11 1 I I 1 1 I 1 I r l x v u 1 l I l 1 l |l 6 MM my D win/F8858ATTORNEYS UNITED STATES PATENT OFFICE.

MARTIN L. SENDERLIN', OF JERSEY CITY, NEW JERSEY.

TRACTOR.

Application filed October 14, 1913.

To all whom it may concern:

Be it known that I, MARTIN L. SENDER- LING, a citizen of the UnltedStates, and a resident of Jersey City, in the county of Hudson and Stateof New Jersey, have invented a new and Improved Tractor, of

which the following'is a full, cleair and ex- -steering mechanismtherefor; to provide alternate power and hand mechanism for operatingsa1d steering mechanism; to provide means for augmenting the tractionexerted' by said unit; to provide means for hanging weighted members onthe carrying members automatically adjustable to the weight sustained;to provide means showing the operating direction of the unit; and toprovide a mechanism adapted for opera-- tive engagement with a carryingbody, having a bolt to swing the same on a self-contained center.

In the drawings, Figure 1 is a top plan view of a unit constructed andarranged in accordance with the present invention, the covering platformof the same being partly removed to .show the mechanism therebelow; Fig.2 is a side view of the same, the covering platform being partly removedand partly in section to show the mechanism contained thereunder; Fig.3- is a vertical cross section taken. on the line 3-3 in Fig. 2; F ig. 4is a detail view on an enlarged scale, showing in vertical longitudinalsection, the king bolt, and the fifth wheel structure and supportingframe of said unit; Fig. 5 is a vertical cross section taken on the line5-5 in Fig. 1; Fig. 6 is a horizontal section taken on the line 6 6 inFig. 4; Fig. 7 is a horizontal section taken on the line 7-7 in Fig. 4;Fig. 8 is a vertical section on an enlarged scale of the steering postand parts connected therewith for operating the said unit; Fig. 9 is ahorizontal section taken as on the line 99 in Fig. 8; Fig 10 is avertical section taken on the line 10 -10 in Fig. 8; Fig. 11 is a detailview in the side elevation, showing a fragment of the trailer chassisand means for connecting and supporting same on the. structure; Fig. 12is a vertical section taken on the line 12-12 in Fig. 11; Fig. 13 is adetail view in front elevation, showing a fragment of the motorSpecification'of Letters Patent.

' tractor.

by bolting to the plate 31, a ring 32 rec-' Patented June 6, 1916.

Serial No. 795,061.

support of the tractor and the connection between the tractor and sidebar of the trailer; Fig. l i is a plan view,.showi1'1g a modified formof transmission mechanism operatively connecting the driving shaft andsteering mechanism; Fig. 15 is a vertical section of the modified form'of the king bolt; Fig. 16 is a plan view of a modified form of thetractor, showing the same operatively united with the trailer to form inconjunctiontherewith a four wheel drive.

The tractor herein described is a twowheeled vehicle. The tractionwheels 20 are rotatively mounted on a dropped center axle 21. Upon theaxle 21, a truck frame having side bars 22 is supported by ellipticalsprings 23. The springs 23' are laminated in form and rigidly-secured tothe axle 21 by the conventional plates and the clip loops 25.

The ends of the springs 23 are flattened to rest on the bearing shoes26, with which the side bars 22 are furnished. Extending between theside bars 22 are the central bolsters 27 disposed relatively midway ofthe length of the said side bars and the brace bars 28 and 29. Extendingbetween the said bolsters 27 is a bearing plate 30, centrally bored toform a bearing for the king bolt of the vehicle. The center ofthe saidopening in the plate 30 is coincidentwith the center of the truck of thetractor. To the bolsters 27 and to the centrally raised portionsthereof, is bolted a plate 31 which forms the web of the turntable orfifth wheel of the The wheel thus mentioned is made tangular in crosssection, a ring 33 Z-shaped in cross section, and a gear toothed ring3 1. As best seen in Fig. 4 of the drawings, the ring 32 when assembledwith the ring 33 fits within the interior angle thereof. while the ring3% fits the exterior angle thereof. The flange of the ring 33 isextendedto overhang the'crown of the teeth on the ring 31 to operate by means ofa bearing for shaft 108, mounted on the ring or section 38, as shownbest in Fig. 3 of the drawings, as a guide for the pinion 36, the teethof which, as shown in Fig. 3 of the drawings, mesh with the teeth of thering 34 or with the teeth of the turntableor fifth wheel of the tractor.The plate 31 of the said wheel primarily supports the weight of the bodyof the tractor. For this purpose the upper surface of the flange 35 ofthe ring 33 is dressed to form a track or hearin for the rin 37 whichring is angular in cross section, the angle being filled by the fillerring 38, which is rectangular in cross section. By means of thisconstruction, the rings and 37 may be replaced to compensate for wearthereon, without necessitating the loss of a relatively large portion ofthe construction.

Tothe rings 37 and 38 is bolted a bed plate 39. The bed plate 39 iscentrally provided with a hub 10. The hub 1O is bored to receive andform a bearing for the elongated hub 11, with which the plate 31 isprovided. The hubs 10 and 11 thus constructed and assembled constitutethe pivot on which the wheel carrying truck and. the motor carrying bodyrelatively turn.

The centerof the bed plate 39 is thickened to form a lining pad 12, saidpad resting upon lining disks 13, which disks are seated in a centralrecess or pocket formed by the dropsection 14 of the plate 31, thereby'forming a relatively continuous bearing for the exterior of the hub 41with the interior of the hub 10. v

The bed plate 39 is shaped to form. a drop section 15 as seats for thelaminated springs 16, which are bolted to the said seats by the clips47, as seen particularly in.

Fig. 1. The said springs 4C6 are disposed-in front of and at the rear ofthe hubs 10 and 11 to extend transversely beyond the sides of the bodyof the tractor to support the trailer, the shackles 48 being providedtherefor as hereinafter more fully set forth. Rigidly bolted to the bedplate 39, are the framing beams 19, to which are secured the side barsof the tractor body, formed by the U-bent angle bar 50, whichconstitutes the base on which the tractor body is constructed.

The traction wheels 20 are each provided for traction purposes with asprocket wheel 51, said sprocket and traction wheels being rigidlysecured. The sprocket wheels 51 are directly connected with sprocketwheels 52,

on the ends of the shafts 53 by means of the sprocket chains 54. Theshafts 53 are united by any suitable form of differential gearingcontained in the gear case 55. The

shafts 53 are suitably mounted .in bearings formed in the boxes 56,which boxes are sus pended from the forward ends of the side bars 29.,(see Figs. 1 and 90f the drawings). To maintain the alinement of theaxle 21 and the shafts 53, the said axle'and shafts are suitablyconnected by the brace rods 57.

The differential gearing mounted in the gear case is immediatelyconnected to be operated by the transmission shaft 58 form-- ing a partof the transmission mechanism, operatively connecting the saiddifferential gearing and the driving shaft of asuitable prime mover 59which is mounted within a bonnet 60. The shaft 58 has fixedly mountedthereon, a bevel gear wheel 51; wi h which a corresponding or immediategear wheel (32 is meshed. The gear wheel 62 is fixedly mounted on ahollow spindle 63, which spindle extends through the hub 41. and has abearing therein. At the upper end of the spindle ('33 a bevelv wheel 61is fixedly mounted. The said wheels 62 and (3 1 and spindle 63 are boundtogether by the screw bolt (35, a nut (36 being provided to draw thebolt upon said members. To support the weight of the spindle 63 and thewheels 62 and (a, to avoid undue thrust of the Wheel 62 on the wheel 61,bearing plates 67 and 63 are provided forming a race for balls 69, whichthereafter support the weight of the said members.

The motor or prime mover 59, bonnet 60 and radiator 70 are mounted onthe bar 50, having pivot shaft sections 71, the ends whereof havebearings in the boxes 72 formed in the brackets 73. The brackets 73 arebolted or suitably mounted upon. the side best in Fig. 13, is directlymounted upon a dropped center brace 76, the ends whereof arestructurally connected with the side extensions of the lJ-bent angle bar50.

The driving shaft of the prime mover 59 is fixedly connected with thetransmission driving shaft 77 by means of a knuckle 78. The shaft 77 issupported in bearings 79 erected on the framing beams 19 provided tosupport the same and mounted upon the side extensions of the angle bar50. Loosely mounted on the shaft 77 and meshed with the wheel 6 1 aretwo oppositely disposed bevel wheels 81 and The wheels 81 and 82 areeach provided with clutch faces to receive the clutch heads 33 and 81respectively. The heads 83 and 34- form a single member, keyed to theshaft 77 and shifted by means of a hand lever 85, the yoke 86 whereofrests between collars forming thebases of the heads 83 and 8 1. As seenbest in Fig. 2 of the drawings, the lever 85 is conveniently disposed tothe driver's seat 87.

It is obvious that as the clutch head 83 or 8st be engaged with thewheel 81 or 82, the wheel 64 and spindle 63 are rotated in relativelyopposite directions. According as the spindle 63 and the wheel 62 arerotated, the shaft 58 is rotatedto transmit to the shafts 53 a rotarydirection, which operate to turnathe traction wheels 20 forward or backas the case may be. Also it will be noted that if the lever 85 be movedto the neutral position where the heads 83 and 84 are both isengagedfrom the wheels 81 and.

82, then the said wheels stand'idly on the shaft 77, the wheel 64, andtransmission mechanism connected therewith, coming to a standstill.

The shaft 77 is continuous in its rotation and is provided with a pinion88. which pinion 88 is meshed with a relatively large gear wheel 39 on acountershaft mourted in bearings 90 and 91, set to one side of the shaft77' and having keyed and slidably mounted thereon a clutch 92. Theclutch 92 is provided with heads 93 and 91 which are adapted to engagethe bevel pinions 95 and 96. The clutch is keyed on the cJuntershaft andis moved from the neutral position shown in Fig. 1, to engage 6131181 ofthe said pinions when the yoke 97 is swung by the shaft 99 being rocked,The bevel pinions 95 and 96 may be regarded. as the controlling wheelsof the power steering mechanism, with which the present tractor isprovided. The said pinions are loosely mounted on the'shaft to rotatetherewith only when the clutch 92 is moved to engage either of the saidpinions. Said pinions are meshed relatively with the large bevel wheel100. The wheel 100 is loosely mounted and free to rotate in eitherdirection when im pelled thereto by the pinions 95 and 96. Continuouslyengaging the wheel 100 is a third pinion 101. Pinion 101 is fixedlymounted on a shaft 102, having at theopposite end a bevel pinion 103,the teeth whereof are meshed with the teeth of a mated bevel pinion104:. Pinicn 104 is mounted upon one end of a transmission shaft 105,which is provided midway with a worm gear 106. The worm gear 106 engagesthe teeth of the worm gear 107, which is at the upper end of verticalshaft 108, at the lower end whereof the pinion 36 meshes with the teethformed on the ring 34 as best seen in Fig. 2 of the drawings.

\Vhen the driver moves the handle 117, on the steering post to rotatethe shaft 113, the yoke 97 moves the clutch 92 into engagement witheither of the bevel pinions 95 or 96. In correspondence with theergagement thus made, the wheel 100 and members oneratively connectedtherewith, are rotated in relatively opposite directions. That is tosay. if the said handle 117 be moved to one side of the median orneutral posiiion, the shaft 106 and pinion 36 will rotatein onedirection to drive the ring 34 and nieinbers connected therewith formingthe fifth wheel of the vehicle. in one rotary direhtion, the tractionwheels 20 accommodatirg the action. If the vehicle be standing still.the traction wheels 20 will track about the selfcontained center of thetractor, which is as stated. coincident with the center of the spindle63. If on the other hand, the handle 117 he moved to the opposite side,the opposit effect 'will be produced on the transmission gear betweenthe wheel 100 and the pinion 36.

The shaft 105 is provided at its forward end with, a second bevel wheel109, the teeth of which bevel wheel engage the teeth of a relativelylarge bevel wheel 110. The wheel 110, (as best seen in Fig. 8 of thedrawings) is fixed on a hollow shaft 111. The hollow shaft 111 extendsupward through the tubular shaft 113. At the upper end of the hollowshaft 111 and fixedly mounted thereon, is a clutch head 11 1, with whichthe hub 115 of the hand wheel 116 engages when moved thereto.

Normally the vehicle in its travels is guided by the play of the handwheel 116.

The driver. by turning the said wheel, ro-

tates the shaft 111 and wheel 110 connected therewith. and by means ofthe said wheel 110 and the wheel 109. rotates the shaft 105 and the wormgear 106 mounted thereon. The wheel 100 and pinions and 96 running ontheir respective shafts. permit this action. The rotation of thevertical shaft 108 resulting from the play of the said wheel 116 turnsthe tractor on its center, to change the direction of movement thereof.The shaft 108 and pinion 36 are supported in service by the bearing 154,which bearing is mounted on the ring 38.

\Vhen it is desired to use power to turn the tractor. the steeringhandle 117 is employed. The handle 117 is suitably yoked to straddle acam wheel 118. fixedly mounted on the shaft 119 extending between thesides of the yoke of the steering handle 117 to support a small handwheel 120, which is slidably mounted on the shaft 119. The wheel 120 isprovided with a clutch hub 121, the teeth whereof engage the teeth 122on the handle 117 and are fixed relative to theshaft 119 to form aclutch member therefor. A spiral spring 123 normally presses inward thewheel 120 to cause the teethof the hub 121 to engage the teeth 122 onthe handle 117. The tension of the spring 123 is regulated by a nut 124(see Fig. 9 of the drawings).

The handle 117 is fixedly attached by means of a key 125 to the tubularshaft 113. The shaft 113 has fixedlv connected therewith and at thebottom thereof. a hub 126, from which extends the arm 127, (see Figs. 1.3 and 8 of the drawings). The arm 127 is pivot'ally connected with a rod128, which is pivotally connected with the hanging arm 129 dropped fromthe short rocking bar 99, (see Fig. 3 of the drawings). At the oppositeend of the rocking bar 99 ishung the must be free to rotate. To avoidthedistraction which would be occasioned by theavneel 16 0 116 rotatingin correspondence with the shaft 111, the said wheel is lifted by meansof the bell crank lever 131 until the hub 115 134. 'wheel 116, there ispreferably secured a is disengaged from the clutch head 114. It is toaccomplish this that 1 provide the ban-- dle wheel 120 and. the camwheel'118 on the shaft 119.

lVhen the clutches .121 and 122 are not looked as shown in Fig. 9 of thedrawings, it is obvious the shaft 119 may be rotated to force the camwheel 118 against the hanging arm of the bell crank lever 131 to liftthe other arm of the said bell crank lever, which is connected with thehub 115 by pins 132.

graduated scale, to be used in conjunction with the pointer 134 toindicate the angle of the set of the traction wheels 20 and the tracktherefor when operated either by power or by hand. The utility of thispresent mechanism is most appreciated, however, when operating thesteering mechanism by power and when the vehicle to which the tractor isattached, is relatively still. The movement of the truck is through anarc of 240 degrees, but rarely if ever through the movement of acomplete circle. To confine, however, the movement of the pointer 134within reasonable limits, a reducing gear train, consisting of thepinion 135, the wheel 136, the pinion 137, the wheel 138, the pinion139, the wheel 140, the pinion 141 and the-wheel 142 is interposedbetween the said solid shaft 133 and'the wheel 110, upon which thepinion 135 is-fixed, while thewheel 142 is fixed upon the lower end ofthe shaft 133. The power drive of the steering mechanism rotates thewheel 110. The reduction of movement incident-to the operation of thegear train above mentioned, is such that the swing of the solid. shaft133 is to the rotation of the wheel 110 relatively minute.

The tractor thus far described is intended to support the front end of asuitable vehicle, said vehicle being provided with chassis having sidebars 143, from which the shackles 48, which. are connected pivot ally tosaid brackets by means of bolts 145, (see Figs. 11 and 12 oft'hedrawings). The shackles 48, it will be remembered, are

Fixedly attached to the swung from the ends of the springs 46 which areseated upon the bed plate 39 and extend transversely across the tractortruck in front and at the rear of the angle bar structure. the side bars143 rest upon the spring 14.6, which spring is secured by means of clips147 to the dropped center brace 76. A flange 148 integrally formed withthe said. brace supports the said spring. This spring 146 thus bearingunder the ends of the side bars 143 operates as a shock absorber toprevent the uplift of the motor bearing end;

tained in the case 152. If desired, the shaft I The extreme forward endsof 150 may be employed to operate, elevate or lift the mechanism used.in conjunction with dumping carts and vehicles of like nature. In fact,the driving shaft 150 may be employed in any capacity for which it issuited, besides that of transmission to the traction axle 151. A chainspeed gear box 153 is employed preferably when connected with the axle151 of the trailer. It is to, be understood that any form of speedcontrol may be employed in connection with the direct drive of thetractor.

1n the modified form of the invention as shown in Fig. 14 of thedrawings, provision is made for an arrangement where it is inconvenientor impossible to connect the shaft 150 with the shaft 77, or with thesteering mechanism operated through shaft 150 of the modified form, Fig.14, which is 'hereinbefore referred toas shaft 105.

111 such cases, a short shaft 155 is rigidly 0011- nected with the shafthaving the clutch 92.

At the end of the shaft 155 a pinion 156 is mounted, the teeth whereofengage the teeth of a large gear Wheel 157. The gear wheel 157 isrigidly connected with a pin'- ion 15.8, concentric with the gear wheel157, the teeth of which pinion. are meshed with the teeth of arelatively large gear wheel 159. lhe gear Wheel159 is fixedly mounted on:a shaft 160, which is substituted for the shaft 105 of the preferredform of mechanism, as seen best in Fig. 1 of the depend the shacklebrackets 144 to receive drawings. Slidably mounted upon and keyed to theshaft 160 is a clutch 161, said ,clutch having reversely-projectedclutch teeth to engage clutch teeth with which bevel pinions 162 and 163areprovided. The

pinions 162 and 163 are meshed with a bevel wheel 16st. The wheel 157and pinion 158 are rigidly connected with a hollow connection tube 165.Preferably, the tube 165 has a passage rectangular in cross section,through which a squared end of the driving shaft 150, or other suitablesubstitute therefor, may be extende In Fig. 15 of the drawings is shownavertical section of the screw bolt 65, showing the same to bepreferably tubular. This construction is preferred as providing meansfor suitably carrying electric wires, steering gear, or other suitablemechanical parts connected with the operation of the invention and inwhich the ends are exposed above and below the fifth-wheel constructionof the tractor, as herein described.

Claims: 1. A two-wheeled tractor, the wheels whereof are laterallyalined; a. rotary truck supported on said wheels; a relativelystationary body pivotally mounted on said truck; a motor mounted on saidbody; transmission mechanism operatively connecting said motor andwheels to rotate the same, said transmission mechanism embodying a.

vertical shaft coaxial with the pivot connection of said body; aplurality of bevel wheels mounted on said shaft, at the oppo site endsthereof; a plurality of mated gear wheels mounted on the driving shaftof said motor to engage one of the gears on said shaft at opposite sidesthereof; a clutch mechanism, embodying a clutch member mounted on thedriving shaft of said motor and manually movable to engage the adjacentbevel wheel on said vertical shaft at opposite sides to'reversely rotatesaid shaft;

. carrying body and partly mounted on said truck body; a plurality ofcarrying springs mounted on said fifth-wheel construction, disposedtransverse to said carrying body,

for supporting the chassis of a vehicle when operatively connected withsaid tractor; and a plurality of carrying springs for said truck bodyinterposed between the carrying wheels and body of said truck body.

3. A two-wheeled tractor, comprising a truck body; a carrying body; amotor mounted on said carrying body; a fifthwheel construction partlymounted on said at. A tractor having two carrying wheels;

a truck mounted on said wheels; a body pivotally mounted on said truck;a prime mover mounted on said body; and a transmission mechanismconnecting said prime mover and said carrying wheels to rotate the same,said transmission mechanism embodying a hollow vertical shaft co-aXialwith the pivot connection of said body and said truck having an integralhub and sleeve member exterior thereto provided with an annular flangeintermediate of its length to support a third member and constitutingsaid pivot connection.

5. A tractor having two carrying wheels; a truck mounted on said wheels;a body pivotally mounted on said truck; a prime mover mounted on saidbody; a fifth wheel, embodying a hollow hub and sleeve member, anannular flange integral therewith, a hollow shaft forming a pivotcoaxial with said hub, sleeve and flange member. a third member co-aXialtherewith mounted thereon and constituting a pivotal support for saidbody on said truck; a transmission mechanism operatively uniting saidprimemover and said carrying wheels, said transmission mechanismembodying a hollow shaft mounted in said hub to extend therethrough; anda steering mechanism, embodying means whereby one section of said fifthwheel may be rotated relative to the other section of said wheel.

6. A tractor having two carrying wheels; a truck mounted on said wheels;a body pivotally mounted on said truck; a prime mover mounted on saidbody; a fifth Wheel supporting said body'on said truck, embodying arelatively large gear toothed ring and a central hub having an annularflange to form a bearing co-axia-l and co-radial for a third member inpivotal relation therewith and constituting the pivotal means for a bodyso'mounted; a transmission mechanism operatively uniting said primemover and said carrying Wheels, said transmission mechanism embodying ahollow shaft mounted in the said hub to extend therethrough, a steeringmechanism embodying a gear pinion and engaging the teeth of saidcarrying wheels,

said ring; and manually operative means mounted on said body forrotating said pinion.

7. A tractor having two carrying wheels; a truck mounted on said wheels;a body. pivotally mounted on said truck; a prime mover mounted on saidbody; a fifth wheel supporting saidbody on said truck embodying arelatively large gear toothed ring and a central hub having an annularflange as support for a third member in a pivotal relatiorr therewith; atransmission mechanism operatively uniting said prime mover and saidcarrying wheels, said transmission mechanism embodying a hollow shaftmounted in the said hub to extend therethrough; a steering mechanismembodying a gear pinion and engaging the teeth of said ring; and a powerdriving mechanism for rotating said gear toothed ring, said powerdriving mechanism embodying a train of gears operatively connecting saidprime finover and said ring.

8. A tractor having two carrying wheels;

I a truck mounted on said wheels; a body pivotally mounted on saidtruck; a prime mover mounted-on said body; a fifth wheel supporting saidbody on said truck, embodying a relatively large gear toothed ring and acentral. hub having an annular flange as support for a third member in apivotal relation therewith; a transmission mechanism operatively unitingsaid prime mover and. said transmission mechanism embodying a hollowshaft mounted in the said hub to extend therethrough; a steeringmechanism embodying a gear pinion and engaging the teeth of said ring; apower driving mechanism for re tating said gear toothed ring, said powerdriving mechanism embodying a train of gears operatively connecting saidprime mover and said ring; and means mounted in said power mechanimn forat will chang ing the rotary direction of said transmission.

9. A tractor. having two carrying wheels; a truck mounted on saidwheels; a body pivotally mounted on said truck; a prime mover mounted onsaid body; a transmission mechanism connecting said prime mover and saidcarrying wheels to rotate the same, said transmission mechanismembodying a hollow vertical shaft coaxial with the pivot con nection ofsaid body and said truck; a plurality of bevel gear wheels mounted onsaid hollow vertical shaft at the opposite ends thereof; a plurality ofmated gear wheels mounted on the driving shaft of said prime mover toengage one of said gear wheels on said vertical shaft and at oppositesides thereof; a clutch mounted upon the gear wheels on the drivingshaft of said prime mover to at will engage the same to move with thedriving shaft of said prime mover; and a central bolt embracing saidpivotal transmission mechanism in a freely rotative relation.

10. A tractor having two carrying wheels; a truck mounted on saidwheels; a body pivotally mounted on said truck; a prime mover mounted onsaid body; a transmission mechanism connecting said prime mover withsaid carrying wheels to rotate the same, said transmission mechanismembodying a hol low vertical shaft having bearings coaxial andcoextensive with the pivot connection bearings of said body and saidtruck; a plurality of bevel gear wheels mounted on said vertical shaftat the opposite ends thereof; a

plurality of mated gear wheels mounted on the driving shaft of saidprime mover to en gage one of said gear wheels on said vertical shaftand at opposite sides thereof; a clutch mounted upon the gear wheels onthe driving shaft of said prime mover to at will engage the same to movewith the driving shaft of said prime mover; and a manually operativemechanism for moving said clutch to engage at will one of the saidwheels.

11. In a tractor as characterized, a twowheeled truck; a body supportedthereon; a prime mover carried by said body; a driving mechanism forsaid wheels; a gear and pinion connection for said body and said truckto rotate the truck in a self-contained center; a manual controllingmechanism for said gear and pinion, embodying a rotary pointer; andareducing gear connecting said gear and pinion and. said pointer asoperative through the pivotal connections of said self-contained center.

12. In a tractor as characterized, a twowheeled truck; a body pivotallymounted thereon; a power unit mounted on said body; a power mechanismfor rotating said truck about a self-contained center; a pointer showingthe operating position of said truck; and a reducing gear connectingsaid pointer and said truck to move the said pointer in correspondencewith said truck, and manually operative from the disjoined motorconnections" with the said self-com tained center.

13. A tractor having a body portion; a prime mover mounted on said bodyportion; a running gear pivotally mounted under said body portion andhaving driving wheels; a transmission mechanism operatively connectingsaid prime mover and said driving wheels, and embodying a hollow r0-tary shaft having gear wheels at each end, said shaft extending betweensaid body portion and running gear and coaxial with the pivot of saidrunning gear; and a central bolt embracing said pivotal transmissionmechanism in a freely rotary relation, said mechanism incorporating meanfor selflubrication. Y

14:. A tractor having a body portion; a prime mover mounted on saidbedyiportion;

a running gear pivotally mounted under said body portion and havingdriving wheels; a transmission mechanism opera tively connecting saidprime'mover and said ative means for operatively connecting anddisconnecting said prime mover and said driving wheels;'and a centralbolt embracing said pivotal transmission mechanism in a freely rotaryrelation, said mechanism incorporating means for self-lubrication. 15. Atractor having a body portion; a prime mover mounted on said bodyportion; a running gear having driving wheels; a fifth wheel operativelyconnecting said body portion and running gear; a rotary shaft disposedcoaxial with said fifth wheel and having transmission gear wheels at theends therebf, one of said wheels being operatively engaged with saidprime mover, and the other of said wheels being operatively engaged withsaid driving wheels; manually operative means for at will operativelyconnecting and disconnecting said prime mover and said rotary shaft anda central bolt embracing said pivotal transmission mechanism in a freelyrotary relation, said mech anism incorporating means forself-lubrication. 16. A tractor having a body portion; a prime movermounted thereon; a truck hav ing two driving carrying wheels; a fifth'wheel pivotally connecting said truck and body portion; and atransmission mechanism operatively engaging said prime mover and saiddriving wheels and embodying a hollow transmission shaft co-extensivewith the main pivotal center as operatively mounted in said truck andsaid body portion, said hollow shaft being co-axial with said fifthwheel and co-eXt-ensive with the said pivotal center supplying effectivemeans whereby to lubricate all pivotal points of contact therewith.

17. A tractor having a body portion; a prime mover mounted thereon; atruck having two driving carrying wheels; a fifth wheel having a hollowhub and sleeve portion pivotally connecting said truck and .Oopiel 0!this patent may be obtained (or body portion ctr-extensive with thespace hetween'the; gear wheels at either end thereof a transmissionmechanism operatively engaging said prime mover and said driving wheelsand embodying a hollow transmission shaft having a] bearing co-axialwith said hub and sleeve portion and extending,

therethrough and operatively mounted in said truck and said bodyportion, said shaft being co-axial with said fifth wheel; and means forat will reversely operatively connecting said transmission shaft andsaid.

prime mover to reversely rotate said driving wheels. I

18. A central hub comprising upper and under co-axial and co-annularsections embodying hub sleeve and flanged portions and peripheral ringsin reverse pivotal engagement; the-upper section having bearings uponits upper face arranged at right angles to its longitudinalalinementadapted to receive and to rigidly support thereon springmembers in combination therewith extended to receive and to resilientlysupport portions of a vehicle mounted thereon whereby road shock to themaximum por-- tion of a lightly running, or loaded vehicle will belargely absorbed thereby.

19. A central hub comprising upper and under coaxial and co-annularsections emmechanism mounted upon that portion of a vehicle pivotallyconnected therewith.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

MARTIN L. SENDERLTNG.

Witnesses:

E. F. MURnocK, G. H. EMSLIE.

five cents each, by addresing the Commissioner of Patents, Washington,.D. 0."

